Original instructions – Rockwell Automation 442L SafeZone Singlezone & Multizone Safety Laser Scanner User Manual
Page 23
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SafeZone™ Safety Laser Scanner User Manual
10000073050, July 2011 21
Original instructions
Figure 22: Risk of reaching over (mm)
The necessary supplement for the safety distance is dependent on the
height of the scan plane for the protective safety field. At low heights
the supplement is larger than at greater heights
.
How to calculate the supplement C:
² If there is enough empty space in front of your machine or equipment,
use 1200 mm for the supplement C.
²
If the safety distance is to be kept as small as possible, calculate C
using the following formula:
C = 1200 mm - (0.4 x H
D
)
Here H
D
is the height at which the protective safety field is mounted.
In summary there are three practical methods of mounting the scan plane
for the SafeZone safety laser scanner. The optimal method depends on
the related application.
Figure 23: Mounting methods for the scan plane
Table 9 provides assistance in making the selection.
Table 9: Advantages and disadvantages of mounting methods
Height of the scan plane at 70 mm resolution
Due to the radial sampling of the protective safety field, the optical
resolution will be lower the further away you get from the scanner.
Figure 24: Relationship between resolution and protective safety field
mounting height
If you choose a resolution of 70 mm in the SCD software for hazardous
area protection, a human leg may, in certain circumstances, not be
detected. The reason in this case would be that the beams miss the ankle
on the left and right
.
If you mount the SafeZone safety laser scanner higher, the scan plane is at
fibula height and the leg is also detected with an object resolution of 70 mm
.
4.1.2 Measures to protect areas not covered by the
SafeZone safety laser scanner
During mounting, areas may be found that are not covered by the safety
laser scanner.
These areas
become larger if the SafeZone safety laser scanner is
mounted using the mounting kits.
Figure 25: Unprotected areas for stationary applications
ATTENTION
Prevent the possibility of crawling
beneath the protective device if you
mount it higher than 300 mm.
Prevent people from being able to crawl
beneath the protective safety field by
means of appropriate mounting of the
SafeZone safety laser scanner. If you
mount the protective device higher
than 300 mm, then prevent crawling
beneath by means of additional
measures. For applications that are
accessible to the public, the mounting
height may need to be reduced to 200
mm (see the appropriate public
regulations).
IMPORTANT
The minimum supplement to prevent
reaching over is 850 mm (arm length).
0
5
8
=
C
0
0
2
1
=
C
H D = 0
H D = 875
C
C
C
H D
H D
H S
H S
H D
H S
Mounting Orientation
Benefit
Disadvantage
Scanner low (H
S
< 300 mm)
Inclination of the scanner plane
No external effects due to
saturation, crawling
Larger supplement C
Scanner high (H
S
> 300 mm)
Inclination of the scanner plane
Lower protective safety field
supplement C
Danger of crawling beneath
(at the front and side)
Scanner low (H
S
< 300 mm)
Inclination of the scanner plane
Lower protective safety field
supplement C
Danger of crawling beneath (at
the front),
H
D
= Detection height
H
S
= Scanner mounting height
X
X
Y
Y